Chuck



G. WILLIAMSON.

CHUCK..

APPLICATION FILED MAR. 6, 1920.

G. WILLIAMSON.

CHUCK.

APPLICATION FILED MAR- 6, |920.

1,391,441, v 4Pmnmsepn 20,1921.

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UNITED STATES PATENT OFFICE.

CHUCK.

i Specification of Letters Patent.

. March 6, 1920. Serial No. 363,793..L v

' To @ZZ whormz't may concern:

Be it known that I, GEORGE WILLIAMSON,

' a subject of the King of Great Britain, re-

siding at Oldham,rin the county of Lancaster, in the Kingdom of England, have invented certain `new and useful Improvements in Chucks, of whichthe following is a specification.-

This invention relates to chucks'and the like rotary work or tool holders applicable lfor use in connection with work centeringapparatus, or for use 1n connection with holding an object to cause itto be rotated as with a mandrel of Y a lathe, Vor for other purposes. Y f

Scroll chucks wherein the jaws are made to advance toward or-recede from the center Y toan equal extent, while serving their pur- Ypose very well, possess the disadvantage that the use of scrolls together with. bevel wheels and pinions add considerably to thel cost of the chuck, andthepresentinvention has been designed to provide an eiiicientV in vertical cross section.

Fig. 3 is a cross-section on the line A B of Fig. 1.

Referring to these drawings the chuck body 1 is provided with a ring 2 which 1s capable of being turned through the segment of a circle by means of a screwed spindle' 3 engaging a nut engaging the squared head of a pin 5 projectingfrom the ring 2. This screwed spindle 3 is journaled at 6 in the chuck body l, and operatesv against ball bearing washers 7 to resist end thrust. The spindle is operated by Aa box key adapted to engage the squared end 8 of the spindle which lies in a recess 9 1n the chuck body so as'not to project therefrom, andthe ring2 is recessed into the face of j the chuck body 1 so as to lie iiush therewith.

Arranged around the axial center line of the chuck, are three or any suitable number of carrier members 10 spaced apart.k These are each mountedon a separate pin 11A secured to the front of the chuckbody'lz at such-a distance from the. chuck axis, that collectively the ring -2 encircles the said pivot pins 11,.and these carriers 10 which maybe triangular in form are each coun Patented Sept. 2,0, 1921. i Original application filed `Tanuary 13, 1917, Serial No. 142,210. Divided and this application .-led

pled to the ring 2 by pins 12 on the carriers l engaging slotsl in the `ring-,so that-the turning of the ringl 2 in one direction or the other will loscillate vthe carriers 10 on their pivot pins 11. At another place each carrier l10 carries a work engaging jaw 14, andvby turning the ring 2 by meansY of the box Spanner, the jaws 14 are adjusted with relation to each other and to the'axis of the chuck to engagev work of` different sizes. These jaws 14 may be of various kinds according to the work to be performed. Ink

the case of holding an objectso that it. can be rotated by the mandrel of a lathe or other machine the jaws maybe made; in stepped form 15 to enablejthem to take hold of pieces of work, the diameter of which varies considerably. Consequently by turning thel ring 2 while the body ofthe chuck is at rest, the carriers 10 are oscillated in one direction or the other on their pivots 11, and the j aws from the center by the turning of the ring,

are heldin the true radial position, the outer end' of the slot 18 advancing toward the pin 17 when the ring is turned' one way, and retreating from the pin when turned the other way. Ifdesired the jaws may consist ofV By making them inclined, the jaws when advanced toward or recededk ever be used and applied tothe carriers. These jaws are interchangeable so that by y disrnounting one type of jaw from the carriers, and substituting another type of jaw,

almost any kind ofwork (or even tools) can be fixed in the chuck, and the diameter of the work to be held, can vary within very wide limits.

The ivot pins 11 on which the lcarriers l() oscil ate, consist of trunnions which enter spigotV fashion into bored holes 19 inthe chuck,body, and are prevented from coming out by'set screws 20 screwed into the end of the trunnions 11` from the rear of the chuck, the heads on the set screws being recessed into washers 21 bearin against shoulders at l the rear of the bored oles, Fig. 3. Inlike manner the4 pivots 16 consist of trunnions which enter spigot fashion into bored holes 22 in the work engaging jaws '14, and `the jaws are prevented fromf'coming `oil'. the

lftrunnions, 16 by set "screws 23 screwed into claim the right to use any or alll modifications vthereof which will serve lfor carrying into effect they objects to be attainedby this invention, in so far as such modifications andV changes may fall within the yspirit and scope of the invention hereinbefore referred to.

This application is a division of my coending 'application Serial No. 142,210, ledy anuary 13, 1917.

I declare that what I claim is j 71. In a device for the purposes mentioned,

the combination of a chuck body, a revoluy ble ring mounted thereon, carrier members mounted on pivot pins secured to the front of the chuck body, work or tool engaging or work centering jaws mounted on the car-vV riers, means for so coupling the carriers to the ring that the turning of the ring willl oscillate the carriers and adjust the jaws with relation to each other, and to the axis ofthe chuck body, and means .for keeping the jawsV radial, ysuch lmeans,comprising projecting pins engaging slots so arranged inV connecv tion with thel ringthat the' outer endV of the slotsadvance toward the pins when the ring is lturned one way and retreat from the pins when the ring is turned the other way. f

2. In a device for the purpose mentioned, the combination of a chuck body, a revoluble ring mounted thereon, carrier members mounted on pivot pins secured to the frontV of the chuckl body; work (or tool) engaging or Work-centering jaws mounted'on the carriers, pins for so coupling the carriers to the ring that the turning of the ring will oscillate the carriers and adjust the jaws with relation to each other and to the-axis of ,thev chuck body, and means for maintaining the jaws in radial position. s l

In witness whereof, I have hereunto signed-m name this llthday of February 1920,in t e presence of two subscribing witnesses* Vitnesses:

CHARLES PORTER RoDwELL, l EWALD SIMPSON MosELnY.

GEORGE wiLLnnusoN.'k 

